Tool-heating furnace.



PATENTED APR. 80, 1907.

W. S. UONANT. TOOL HEATING FURNACE. APPLICATION FILED 51111530. 1905.

WITNESSES:

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5 is of smaller dimensions than the outer cas- 5 By manipulation ol the valves the mixture UNITED STATES PATENT OFFICE.

WILLIAM S. OONANT, OF DETROIT, MICHIGAN, ASSIGNOR TO BRISCOE MANU- FAOTURING 00., OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

TOOL-LHEATING FURNACE.

Specification of Letters Patent.

Patented April 30, 1907.

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Be it known that I, lVILLLiM? S. CONANT, a l citizen of the United States of America, rcsiding at Detroit, in the county of \Vayne i and State of Michigan, have invented certain new and useful Improvements in Tool-Heating Furnaces, of which the following is a specification, reference being had therein to i the accompanying drawings.

This invention relates to improvements in tool-heating furnaces and especially to gas furnaces for heating soldering irons and similar articles.

The object of tho invention is to provide a furnace for the purpose which is very simple, cheap and cllicicnt, the same being so constructed that no special machinery or tools are required in its manufacture and the stock and parts for which may be purchased in the open market.

It is also an object of the invention to provide a very simple and cilicient burner which is so arranged as to direct the flames into the furnace in the most effective manner, and to provide the device with certain other new and useful features, all as hereinafter more fully describedand particularly pointed out in the claims, reference being had to the accompanying drawing, in which Figure 1, is a perspective view of a device l embodying the invention; Fig. 2, alongitudinal vertical section of the same on the line 1 yy, Fig. 1 and Fig. 3, a horizontal section on the line z2, Fig. 2.

1 is an outer rectangular casing formed of sheet metal the rear end of which is formed by a flanged head 2 set into the end of the l casing or body and secured in place by rivets, and the forward end is formed by cutting away portions of the metal of the body and folding the remaining triangular shaped portions 3 inward beneath a llangc l formed on the outer end of an inner cast chamber or body 5, said portions 3 being secured to said flange by screw bolts 6. The inner chamber ing so that a space is left at the sides, top and bottom, and rear end of the body, and this i space is filled with mineral wool 7 or similar material to prevent radiation and consequent loss of heat. The forward end of the inner chamber is left open for the reception of the soldering irons and a circulation of air is maintained through the furnace by providing the same with a stack or pipe 8 extending through the top of the outer casing and communicating with the interior of the chamber near its closed rear end.

The chamber 5 is formed with a deep trans verse channel or groove 9 in its bottom at a distancc from its for ward open end, and through an opening 10 in the side wall of the casing and a similar opening in the end of the channel, the burner 11 is inserted, the same lying within the channel wholly below the plane of the surface of the bottom. Said burner consists of a cylindrical head having a perforated end 12 and into its opposite end is screwed a rcduclng plug 13 having a screwthrcaded opening to receive the end of a pipe 1 1 of smaller diameter than the head.

To the outer end of the pipe 14 is attached by means of a suitable coupling 15 a pipe leading to any suitable air supply (not shown) under pressure, and avalve 16 in said pipe is provided to control the flow of air to the burner. In the pipe 14 between the said valve and the burner is inserted a too 17 to which a gas supply pipe 18 is connected, said pipe being provided with a valve 19 to control the flow of gas. \Vhen the said valves 16 and 19 are opened the air under pressure rushes through the pipe 14 and, mixing with the incoming gas from the pipe 18 passes into the burner and is forced out through the perforations in line streams. The soldering irons or other articles to be heated are inserted in the inner chamber and supported by the bottom thereof with their ends projecting over the channel 9 therein. The combustible mixture of air and gas as it issues from the burner is ignited and the flames, being projected longitudinally of the channel with a great deal of force, impinge upon the under sides of the irons and striking the wall of the furnace at the closed end of the channel are deflected therebybackward over and across the upper sides of the irons and thus the full effect of the flame is secured and the irons very quickly and effectually heated.

of air and gas may be regulated to a niccty to secure the very best results, and as the valves, piping and burner are common stock fittings, the device is very cheap and easy to make. The double walls filled between with mineral wool or a similar substance prevents radiation and the inner chamber being formed of cast iron, after becoming heated retains the heat, and therefore the furnaces is easily and quickly heated and there is comparatively little loss by radiation or otherwise, making the device very economical in the use of fuel.

Having thus fully described my invention, what I claim is 1. In a furnace, the combination of a chamber formed with an open end and a channel in its bottom having an opening at one end and extending transversely of the chamber, and a burner extending into said channel through said opening and arranged to project the flame therefrom longitudinally of the channel and against the wall of the chamber at the end of the channel opposite that through which the burner extends.

2. In a furnace, the combination with an outer casing, of an inner chamber supported within said casing and provided with a channel in its bottom extending transversely thereof, a burner extending through the side wall of the casing and chamber into one end of said channel and consisting of a cylindrical head provided with an inner perforated end, a supply pipe screwed into the open end of said head, means for supplying air and gas to said pipe, and valves to control the flow of the air and gas.

3. In a tool-heating furnace, the combination of an outer casing consisting of a rectangular body formed of sheet metal cut to form triangular portions at one end which are turned inward to form the end wall and provided with a flanged head secured within the opposite end of the body, an inner cast cham ber open at one end and supported within the casing with its open end extending through the end of the casing, a flange on the open end of the chamber secured to the triangular end portions of the casing, a filling of mineral wool or similar material between the casing and chamber, said casing and chamber having an opening, and a burner extending through said openings in the side wall of the casing and chamber.

4. In a toolheating furnace, the combination with an outer sheet metal casing having an opening in its side wall, of an inner cast chamber having an open end, and supported in said casing with its open end extending through the end wall of the casing and formed. with a channel in its bottom extending transversely of the same and having an opening in one end opposite the opening in the casing, a filling of mineral wool or similar material between said casing and chamber, a cylindrical shaped burner extending through the openings in the casing and channel and having a perforated inner end, a reducing plug screwed into the opposite end of the burner, a supply pipe engaging the plug, a valve in the supply pipe, a gas supply pipe connected to the supply pipe between said valve and burner, and a valve in the gas supply pipe.

In testimony whereof I aflix my signature in presence of two witnesses.

\VILLIAM S. CONANT.

itnesses LEW'IS E. FLANDERS, OTTO F. BARTHEL. 

